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Move to "Port alias". This section is for creating aliases that can be used in
subsequent settings for firewall rules. You can, for example, define the alias
"any_ip" mapped to "0.0.0.0/0," so later you can directly write "any_ip" to indicate
that some firewall rule should reference any IP address.
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Click the "+" icon to add a new port alias. You can also edit an existing alias by
clicking the "pencil" icon, or delete one by clicking the "red trash" icon.